What Would Happen to the Lac Operon in the Absence

What would happen to the lac operon in the absence of allolactose?

A) The structural genes within the lac operon will be constitutively transcribed.
B) The activator protein will be bound to the operator, which will turn on the structural gene behind it.
C) The repressor regulator protein binds to the operator and prevents the transcription of the structural gene.
D) The catabolite activator protein becomes inactivated and no transcription occurs.
E) The cAMP level rises in the absence of allolactose, which in turn inactivates the transcription.